Coating processes – Frictional application
Patent
1976-12-09
1978-09-05
Hoffman, James R.
Coating processes
Frictional application
427 74, 427 84, 427197, 427203, 427228, 427249, 427266, 427333, 427402, B05D 136, B05D 512, B05D 100, B05D 724
Patent
active
041121350
ABSTRACT:
It is desirable to coat large area, thin sheets of large-grain polycrystalline silicon on an inexpensive ceramic substrate for use in solar cell applications and the like. Such ceramic substrates as are used are chosen from those having thermal expansion coefficients similar to those of silicon. The ceramics meeting these requirements, for example mullite, alumina and zirconia, when brought into contact with molten silicon, however, are not wet by the silicon and no coating takes place. In this invention the method of coating includes the step of carbonizing the surface of such a substrate and then contacting the carbonized surface of the ceramic with the molten silicon, whereupon a large-grain silicon coating is produced wherever the ceramic is carbonized. In this way the ceramic of the type which is not wet by molten silicon can be successfully coated with silicon.
REFERENCES:
patent: 2788297 (1957-04-01), Louis
patent: 3027278 (1962-03-01), Reick
patent: 3137590 (1964-06-01), Coes
patent: 3377697 (1968-04-01), Hobbs
patent: 3480702 (1969-11-01), Ford
patent: 3874899 (1975-04-01), Miszenti et al.
Heaps Joseph D.
Tufte Obert N.
Dahle Omund R.
Hoffman James R.
Honeywell Inc.
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